Plaster-receiving board



H. A. QUA/IFEA ANDA. D; STEWART.v

FLASER RECEIVING BOARD.'

LncATxoN man luNE 21. 1921.'

APP

naamw A. omar-na, or emanan, ILLINOIS, aan ALBERT n. STEWART, or Anavrant v omo.. l

PLASTIEK-RECEIVING BQARD.

Application tiled June 21, 1921. Seriailo. 479,181.

To Aall whom it may concern.'

Be it known that we, HARRY and ALBERT D. STEWART, citizens of the United States, respectively residing at Chicago, inthe county of 'Cook and State of Illinois, and at Dayton, in the county of Montgomery and State of Ohio,l have invented certain new and useful Improvements in Plaster-Receiving Boards, of which the following is a specification.

The invention relates to improvements in =plaster receiving boards.

One of the objects of the invention is to provide an improved plaster receiving board or sheeting to' which to apply and key plaster.

Another object is to provide an improved means to key the plaster to such support-s.

Another object is to lprovide a plaster receiving board that is waterproof, easy to apply, inexpensive to. manufacture, suficiently strong and remarkably durable.y

Other, further and more specific objects ot the invention will become readily apparent, to persons skilled in the art, from a con sideration of the following description,

when taken in conjunction with the draw-l ings, wherein Fig. l shows a section taken on line l-l of Fig. 2. l

Fig. 2 is an elevation of a wall showing part after the plaster has been applied.

Fig. 3 is a section on line 3 billig. 2 of one form of the device showing' the manner in which the plaster keys through the openings in the sheet.

Fig. 4 is a similar view taken on line 4 of Fig. 2 showing another form oi open- 4in".

ig. 5 is a face view of a portion of a. sheet showing the sort oi opening shown 'in Fig. 4.

In all the views the same reference characters are employed to indicate similar parts.

The plaster receiving sheet may be made of strawboard, coated on each side with a more or less adhesive waterproof material, such as asphalt. At suitable intervals, openings are punched through the plasterboard to provide keys to receive the plaster` to thus mechanically hold the plaster inI intimate contact with the supporting structure.

The board may be made of a lurality of sheets stuck together; two or t ree as the situation may require, and both sides of each AICUiarnn .of making the Iboard waterproof1 by a slit 8, are preferably made througl'r the' lthe plaster. is resisted at the keys by the sheet, in any event, are covered with the wind resisting waterproofl coating', or the waterproofing material may be incorporated vrwith the fibrous material inthe beater en-f gine. The lnvention includes any manner instead of `punching partsjout to provide i theA holes 5 parallel slits 6 and 7 connected' together by the mid-portions'and separated board to provide Wings 9 and 1G` which open laterally by application of pressure at the timl when thev plaster l1 is applied to the wa The outward deflection of the wings 9 and 7.0 l() to admit the plaster keys 12 serve, in each instance, as an ar'clrand strengthen the bonard to hold the plaster i'n place. The board ap pears at the rear., after the plaster is appl1ed,as a seresof closely proximatihg laterally extending arches. The result is that they contribute in :y largelyto the strength of the board, and when the board is part off. a ceiling the plaster is thus prevented fronif sagging. The stress, due to the weight of wings in line. with their length and not tra-nsversely thereof, the key of the plaster op. @rating just as the vkeystone, of an-arch inits etlect upon the supporting members thereof.

The board may beA made in continuous sheets and rolled up into rolls for convenient shipping and storing, just as asphalt roof- 'ing is made and prepared for the market.

The drawings show a three-ply board 13v nailed to studs 14 by nails 15. The board may be made ot' any suitable Width,l 32 inches or 4 8 inches wide, to conveniently bridge two or 'more spaced apart studs. y

By coating,r the fiber board on both 4of its sides with a water-proof material it will not buckle appreciably upon application of the moisture contained in the green plaster and the fibrous materialv is thereafter protectedtrom the deleterious effec-t of moisture. ue to changinglr atmospheric conditions.

lzivin'p described our invention whatwe' claim as new land desire to secure by Letters Patent iszV l. A plaster receiving board having' a plurality of uniformly spaced apart` unobstruct ed openings. earl-i opening boundedon two of its opposite sides by" Wings arranged to be laterally deflected from the board, thereby so, i,

surA

side the baai-@opposite m ha, on which 10 ings therein when tue pasler has ben apped, each Upenng bounded fm wo exbe olxtstandint; wings, with i Y free facig and extending awzay the side which he pasei is he a@ plied [In tesmuny whereof nfs.

we heeumo HARRY A. CUFER. All )ERT D. STEWART, 

